Unless you tent and fumigate the entirety of Paris or heat treat it, meaning bringing the temperature of Paris to ~118° for 90 minutes, the other options are...middling in effectiveness.

Also, neither of those treatments keep bedbugs from reinfesting a second after the treatment concludes. (There are no treatments that do. Zero. Ziltch.) And since bedbugs are hitchhikers that can also hide in the tiniest of cracks and crevices, such as fitting between your wall and socket cover, total and permanent eradication is unlikely. The only possibility is if a bait treatment similar to those used for roaches that alters the DNA of the next generation so they can't reproduce is created and actually attracts bedbugs more than a nice blood filled human.

In dense population centers like Paris total elimination at this point in time is incredibly unlikely. They could with continuous effective treatments bring it under a semblance of control but they will always be there. The Olympics will almost certainly exacerbate the issue.